Refrigerant injection device for refrigerant destruction facility

ABSTRACT

Featured is a refrigerant injection device which is particularly suitable for use in a refrigerant destruction facility using an incinerator. Such an injection device includes a storage device which stores the refrigerant and a decompressor fluidly coupled to the storage device. The injection device further includes two flow meters and a cutoff-valve that are fluidly coupled to the decompressor. The cutoff valve is configured to cut off the injection of refrigerant. The injection device further includes bypass flow members that are fluidly coupled to the two flow meters. The bypass flow members and flow meters are configured and arranged to selectively measure the flow rate and to perform flow meter calibration without stopping the feeding of refrigerant to the injection device.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims under 35 U.S.C. §119(a) the benefit of KoreanPatent Application No. 10-2009-0091452 filed Sep. 28, 2009, the entirecontents of which are incorporated herein by reference.

BACKGROUND

(a) Technical Field

The present disclosure relates to a refrigerant injection device for arefrigerant destruction facility. More particularly, it relates to arefrigerant injection device which is applicable to a refrigerantdestruction facility using an incinerator such as a gasification meltingsystem, a rotary Kiln furnace, a stocker furnace, etc. and a dedicatedcombustion furnace.

(b) Background Art

A refrigerant gas such as Freon is generically used in variousrefrigeration systems. When Freon is released into the air oratmosphere, it becomes an environmental pollutant as it destroys theozone layer. Therefore, the use and discharge of Freon is regulated bylaws.

The waste refrigerant that is produced during collection, recovery, anddisposal typically includes chlorofluorocarbon (CFC) which is as anozone-depleting substance, and hydrofluorocarbon (HFC), which is aglobal warming substance.

In general, more than 99.9% of refrigerant such as CFC and HFC isdestroyed using an incinerator such as a gasification melting system, arotary Kiln furnace, a stocker furnace, etc. or using a dedicatedcombustion furnace, which maintains the temperature above 800° C. with aretention time of more than 2 seconds.

There is shown in FIG. 1 a refrigerant injection device used incombination with in an incinerator 18 used in Japan. The refrigerantinjection device injects refrigerant into the incinerator 18 byincreasing the evaporation rate of the refrigerant using a hot-waterbath type vaporizer 10 and an external heating type heater 12 so therefrigerant is decomposed by a reaction with steam at a hightemperature.

The refrigerant injection device includes a hot-water bath typevaporizer 10, a valve 11, a heater 12, an oil filter 13, a mist filter14, a flowmeter 15 and a metering valve 16. The hot-water bath typevaporizer 10 vaporizes the refrigerant in a refrigerant container. Thevalve 11 is provided for selectively opening and closing the vaporizer10. The heater 12 is connected to the vaporizer 10 and heats thevaporized refrigerant to room temperature. The oil filter 13 and mistfilter 14 are connected to the heater 12 and remove oil and mist. Theflowmeter 15 and metering valve 16 are connected to the filters 13 and14 and control the flow rate of refrigerant.

Such a refrigerant injection device includes an injection pipe 17 thatis connected to the incinerator 18 so as to directly inject therefrigerant into the incinerator 18 and a cooler 19. The cooler isprovided to prevent the device from being damaged by the heat of theincinerator 18.

Because the refrigerant is discharged from the refrigerant containerwithout pressure control, the refrigerant injection device shouldincrease the evaporation rate of refrigerant using the hot-water bathtype vaporizer 10 and the heater 12 to improve the injection of therefrigerant into the incinerator 18.

The vaporizer 10 vaporizes the refrigerant in the refrigerant containerusing hot water of 20 to 40° C. Alternatively, a hot-water spray typevaporizer or a hot blast heating type vaporizer is used for thehot-water bath type vaporizer 10 of FIG. 1.

The heater 12 is maintained at a temperature of 40 to 60° C. using anexternal heating coil. The heater 12 heats the vaporized refrigerantsuch that it is above room temperature.

Any oil or mist that may be in the refrigerant gas is/are removed fromthe refrigerant gas at a temperature above room temperature by the oiland mist filters 13, 14. The flow rate of the refrigerant gas iscontrolled by the flowmeter 15 and the metering valve 16. Therefrigerant gas is injected into the incinerator 18 through theinjection pipe 17. Coolant having a temperature of 5 to 20° C. producedfrom the cooler 19, circulates through the injection pipe 17. Asprovided herein, this is done to prevent damage to the injection deviceby the heat of the incinerator 18.

As the energy consumed by the vaporizer 10, the heater 12, and thecooler 19 is increased, the cost for treating the waste refrigerant isincreased, and the space required for the vaporizer 10, the heater 12,and the cooler 19 also is increased.

In addition, when using the conventional refrigerant injection devicehaving a single flowmeter 15, it is difficult to precisely control theflow rate. Also, it is necessary to stop the injection of refrigerantduring calibration of the flowmeter 15 and in the event of a failure inthe flowmeter 15.

The above information disclosed in this Background section is only forenhancement of understanding of the background of the invention andtherefore it may contain information that does not form the prior artthat is already known in this country to a person of ordinary skill inthe art.

SUMMARY OF THE DISCLOSURE

The present invention features a refrigerant injection device for arefrigerant destruction facility. Such a refrigerant injection device ofthe present invention advantageously reduces energy cost andinstallation space requirements of the device. In more particularembodiments, such a refrigerant injection device of the presentinvention includes a decompressor. As further described herein such adecompressor provides a mechanism by which the evaporation rate ofrefrigerant gas can be increased as compared to a conventionalrefrigerant injection device which employs a vaporizer, a heater, and acooler which require large energy consumption.

In further embodiments, such a refrigerant injection device for arefrigerant destruction facility includes two flowmeters for measuringthe flow rate of refrigerant. This arrangement provides a mechanism forprecisely measure the flow rate of refrigerant thereby also providing amechanism dor stably injecting the refrigerant into an incinerator ofthe refrigerant destruction facility.

According to another aspect of the present invention such a refrigerantinjection device for a refrigerant destruction facility, includes arefrigerant container in which is stored refrigerant; a decompressorconnected to the refrigerant container which is operated to decompressthe refrigerant and thereby easily evaporated the refrigerant; and aflowmeter measuring the flow rate of the refrigerant as decompressed bythe decompressor.

It is understood that the term “vehicle” or “vehicular” or other similarterm as used herein is inclusive of motor vehicles in general such aspassenger automobiles including sports utility vehicles (SUV), buses,trucks, various commercial vehicles, watercraft including a variety ofboats and ships, aircraft, and the like, and includes hybrid vehicles,electric vehicles, plug-in hybrid electric vehicles, hydrogen-poweredvehicles and other alternative fuel vehicles (e.g. fuels derived fromresources other than petroleum). As referred to herein, a hybrid vehicleis a vehicle that has two or more sources of power, for example bothgasoline-powered and electric-powered vehicles. Other aspects andembodiments of the present invention are discussed below.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features of the present invention will now bedescribed in detail with reference to the following detailed descriptiontaken in conjunction with the accompanying drawing figures which aregiven hereinbelow by way of illustration only, and thus are notlimitative of the present invention, wherein like reference charactersdenote corresponding parts throughout the several views and wherein:

FIG. 1 is a schematic diagram showing the configuration of aconventional refrigerant injection device for a refrigerant destructionfacility.

FIG. 2 is a schematic diagram showing the configuration of a refrigerantinjection device for a refrigerant destruction facility according to thepresent invention.

FIG. 3 is another schematic diagram provided to illustrate operation ofthe refrigerant injection device of FIG. 2 during normal operation.

FIG. 4 is another schematic diagram provided to illustrate operation ofthe refrigerant injection device of FIG. 2 during calibration of a firstflowmeter.

FIG. 5 is another schematic diagram provided to illustrate operation ofthe refrigerant injection device of FIG. 2 during calibration of asecond flowmeter.

Reference numerals set forth in the drawing figures include reference tothe following elements as further discussed below:

100: refrigerant container 101: first valve 102: manometer 110:decompressor 120: drain box 121: first coolant line 122: second coolantline 123: sampling port 130: oil filter 131: mist filter 140: firstflowmeter 141: second valve 142: first bypass pipe 143: bypass valve150: second flowmeter 151: third valve 152: second bypass pipe 153:bypass valve 160: metering valve 161: check valve 162: cut-off valve170: refrigerant destruction facility 171: injection pipe

It should be understood that the appended drawings are not necessarilyto scale, present a somewhat simplified representation of variouspreferred features illustrative of the operation of the invention. Also,the specific features of the present invention as described herein, caninclude, for example, specific dimensions, orientations, locations, andshapes; however these are not intended to be limiting as these featureswill be determined by one skilled in the art in part by the particularintended application and use environment.

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DETAILED DESCRIPTION

Featured is a refrigerant injection device which is particularlysuitable for use in a refrigerant destruction facility using anincinerator. Such an injection device includes a storage device whichstores the refrigerant and a decompressor that is fluidly coupled to thestorage device. The injection device further includes two flow metersand a cutoff-valve that are fluidly coupled to the decompressor. Thecutoff valve is configured to cut off the injection of refrigerant. Theinjection device further includes bypass flow members that are fluidlycoupled to the two flow meters. The bypass flow members and flow metersare configured and arranged to selectively measure the flow rate and toperform flow meter calibration without stopping the feeding ofrefrigerant to the injection device.

Hereinafter reference will now be made in detail to various embodimentsof the present invention, examples of which are illustrated in theaccompanying drawings and described below. While the invention will bedescribed in conjunction with exemplary embodiments, it will beunderstood that present description is not intended to limit theinvention to those exemplary embodiments. On the contrary, the inventionis intended to cover not only the exemplary embodiments, but alsovarious alternatives, modifications, equivalents and other embodiments,which may be included within the spirit and scope of the invention asdefined by the appended claims.

Referring now to the various figures of the drawing wherein likereference characters refer to like parts, there is shown in FIG. 2 aschematic diagram of a refrigerant injection device for a refrigerantdestruction facility in accordance with the present invention.

Such a refrigerant injection device includes a refrigerant container100, a decompressor 110, an oil filter 130, a mist filter 131, aplurality of flowmeters 140, 145, and a metering valve 160.

Refrigerant, such as that recovered from any of a number of articlesknown to those skilled in the art which utilize refrigerant, such as airconditioners, refrigerators, is stored in the refrigerant container 100.Typically the refrigerant is stored under a high pressure such as forexample, 5 to 10 kgf/cm². Such a injection device also includes a firstvalve 101 that is fluidly coupled to the container 100 and is providedfor opening and closing a refrigerant flow path of the refrigerantcontainer 100. In more particular embodiments, the first valve 101 isinstalled in piping on the top of the refrigerant container 100.

In further embodiments, the injection device further includes a pressuregauge 102 that measures measure the pressure of the refrigerant beingdischarged from the refrigerant container 100. Such a pressure gauge isany of a number of pressure gauges known to those skilled in the art andotherwise appropriate for the intended use. In a particular embodiment,the pressure gauge 102 is a manometer that is fluidly coupled to pipingextending between and fluidly coupling the first valve 101 and thedecompressor 110.

The decompressor 110 is any of a number of decompressors known to thoseskilled in the art and otherwise appropriate for the intended use. [ISTHERE AN EXAMPLE OF SUCH A DECOMPRESSOR??] In particular embodiments,the decompressor is configurable so that the refrigerant stored in therefrigerant container 100 evaporates responsive to the decompressionaction of the decompressor. In yet more particular embodiments, thedecompressor is configured so as to increase the evaporation rate of therefrigerant as compared to conventional injection devices.

For example and in illustrative embodiments, the decompressor 110 isconfigured so as to be operable to reduce the pressure of therefrigerant from a high pressure (e.g., 5 to 10 kgf/cm²) to a lowpressure (e.g., 0 to 3 kgf/cm²) such that the refrigerant in therefrigerant container 100 has an appropriate pressure (e.g., about 1.0kgf/cm²) whereby the refrigerant is injected into a refrigerantdestruction facility 170.

The oil filter 130 is fluidly connected to the decompressor 110 via apipe and configured so as to remove oil contained in the refrigerantvaporized by the decompressor 110. The mist filter 131 is fluidlyconnected to the oil filter 130 and is configured so as to removeimpurities such as dust and foreign matter contained in the refrigerantfrom which oil is removed. In further embodiments, such an injectiondevice further includes a drain box 120 for storing oil and mistfiltered by the oil filter 130 and the mist filter 131. Such a drain boxis provided at the bottom of the oil and mist filters 130,131.

In yet further embodiments, such an injection device further includes asampling port 123 for analyzing the purity of the refrigerant beinginjected into the refrigerant destruction facility 170. In moreparticular embodiments, the sampling port 123 is provided downstream ofthe mist filter, more particularly at the rear of the mist filter 131.In yet more particular embodiments, a flexible hose is provided andconnected to the sampling port 123 to facilitate the collection of asample.

In yet further embodiments, another pressure gauge 102 or manometer isinstalled in the piping extending downstream of the filters 130, 131(e.g., downsteam of the sampling port 123. Such a pressure gauge isprovided to measure the pressure of injected refrigerant and is usedtogether when the decompressor 110 is controlled to provide anappropriate pressure at which the refrigerant is injected into therefrigerant destruction facility 170.

The flowmeters 140, 145 and the metering valve 160 are arranged andconfigured so as to control the flow rate of the refrigerant in whichoil and foreign matter are removed. In more particular embodiments, theinjection device includes at least two flowmeters 140 and 150 that areconnected in series. Also included at each of the flow meters 140, 150are bypass pipes 142 and 152 and valves 141, 143, 151, and 153. Thebypass pipes and vales are configured and arranged at each of theflowmeters 140 and 150 so refrigerant can be injected into therefrigerant destruction facility 170 in the case one of the flowmetershas failed or when a flowmeter is undergoing calibration.

In yet more particular embodiments, the injection device includes afirst flowmeter 140 and a second flowmeter 150 that are connected inseries. The second valves 141 are provided at the front and the rear ofthe first flowmeter 140, and the third valves 151 are also provided atthe front and the rear of the second flowmeter 150. In addition, a firstbypass pipe 142 and a second bypass pipe 152 are provided at the firstflowmeter 140 and the second flowmeter 150. The bypass pipes areparticualry suitable for performing calibration of the first and secondflowmeters 140 and 150.

One end of the first bypass pipe 142 is connected between the secondvalve 141 at the upstream side and the pressure gauge 102 or manometer.The other end of the first bypass pipe 142 is connected between thesecond valve 141 at the downstream side and the third valve 151 at theupstream side such that the refrigerant, from which oil and dust areremoved, is introduced into the second flowmeter 150, without passingthrough the first flowmeter 140. Also, a bypass valve 143 for openingand closing the pipe is installed in the first bypass pipe 142.

One end of the second bypass pipe 152 is connected between the secondvalve 141 at the downstream side and the third valve 151 at the upstreamside, and the other end of the second bypass pipe 152 is connectedbetween the third valve 151 at the downstream side and the meteringvalve 160 such that the refrigerant measured by the first flowmeter 140is introduced into the metering valve 160, without passing through thesecond flowmeter 150. Also, a bypass valve 153 for opening and closingthe pipe is disposed in the second bypass pipe 152.

In yet further embodiments, the injection device further includes acheck valve 161 that is disposed in the pipe at the rear of the meteringvalve 160 to prevent the refrigerant, which is introduced into therefrigerant destruction facility 170, from flowing backward.

In further embodiments, the injection device includes an injection pipe171 that is provided at one side of the refrigerant destruction facility170, and a cut-off valve 162 is provided between the check valve 161 andthe injection pipe 171. The cut-off valve 162 provides a mechanism so asto rapidly cut off the flow rate of refrigerant in the event of anemergency of the refrigerant destruction facility 170.

The refrigerant destruction facility 170 serves to decompose therefrigerant by allowing the refrigerant introduced through the injectionpipe 171 to react with steam at a high temperature.

The operation and effect of the refrigerant injection device for therefrigerant destruction facility 170 in accordance with the presentinvention is discussed below. Reference shall be made to FIG. 2 forfunctionalities of the refrigerant injection device not otherwisediscussed below.

Typically, waste refrigerant is recovered from the place where it isproduced or where it was being utilized in a container of 20 to 1,000 Kgby a refrigerant recovery machine. As the boiling point of therefrigerant such as CFC and HFC injected into the refrigerant injectiondevice is less than −20° C., it is evaporated under atmosphericconditions.

Therefore, in the present invention, the pressure of refrigerant to beinjected into the refrigerant destruction facility is reduced by thedecompressor 110 and thereby evaporated.

The decompressor 110 reduces the pressure of refrigerant stored in therefrigerant container 100 from 5 to 10 kgf/cm² to 0 to 3 kgf/cm² suchthat the refrigerant in the refrigerant container 100 can be injectedinto the refrigerant destruction facility 170.

As described herein, any oil and/or mist that is contained in therefrigerant (gas) at a temperature above room temperature anddecompressed to a predetermined pressure by the decompressor 110, areremoved by the oil filter 130 and the mist filter 131. Also, the flowrate of the refrigerant is controlled by the flowmeters 140, 150 and themetering valve 160. Therrafter, the refrigerant gas is injected into therefrigerant destruction facility 170 through the injection pipe 171 anddecomposed by the reaction with steam at a high temperature.

Thus and unlike the conventional refrigerant injection device whichemploys a vaporizer, a heater, and a cooler which require large energyconsumption, when using the refrigerant injection device of the presentinvention, the refrigerant gas is evaporated by the decompressor 110. Inthis way, it is possible to reduce the cost of energy consumed fortreating the waste refrigerant and reduce the installation space of thedevice.

The refrigerant such as CFC and HFC is decomposed by the reaction withsteam at a high temperature.

In general, more than 99.9% of refrigerant such as CFC and HFC isdestroyed at a temperature above 800° C. for a retention time of morethan 2 seconds. Hydrogen chloride (HCl) and hydrogen fluoride (HF)produced by the destruction of refrigerant are neutralized into CaCl₂and CaF₂ by the addition of an alkaline reagent such as Ca(OH)₂ and thenremoved in post-treatment equipment of the refrigerant destructionfacility as follows.

(1) Stabilization reaction of CFC-12 refrigerant:

2HCl+Ca(OH)₂→CaCl₂+2H₂O

(2) Stabilization reaction of HFC-134a refrigerant:

2HF+Ca(OH)₂→CaF₂+2H₂O

The refrigerant injection device for the refrigerant destructionfacility in accordance with the present invention employs first andsecond flowmeters 140 and 150 connected in series. with such anarrangement, it is possible to increase the time of use and to preciselymeasure and accumulate the amount of refrigerant injected into therefrigerant destruction facility.

Referring now to FIG. 3, there is shown a schematic diagram illustratingoperation of the refrigerant injection device for the refrigerantdestruction facility in accordance with an embodiment of the presentinvention during normal operation. During normal operation, the bypassvalves 143 and 153 of the first and second bypass pipes 142 and 152 thatare connected to the first and second flowmeters 140 and 150 are closed.As a result, the refrigerant passing through the oil filter 130 and themist filter 131 is injected into the refrigerant destruction facility170 through the first and second flowmeters 140 and 150.

In this embodiment, the first and second flowmeters 140 and 150 measurethe flow rate of the refrigerant, respectively, to obtain a more preciseflow rate by correcting the measurement values obtained by the twoflowmeters 140 and 150.

Referring now to FIGS. 4 and 5, there are shown schematic diagramsillustrating the operation of the refrigerant injection device duringcalibration of the first and second flowmeters.

Because an error can occur in the flowmeter when it is being used for along time, it is typical practice to periodically calibrate theflowmeter. The calibration is done to correct the measurement value ofthe used flowmeter by comparing it with that of a reliable standardflowmeter.

Because conventional refrigerant injection device usually have a singleflowmeter, it is necessary to stop operation of the device duringcalibration. In contrast, as the refrigerant injection device accordingto the present invention has the two flowmeters and two bypass pipes,the injection device can continue perform calibration without stoppingoperation of the injection device.

The calibration of the flowmeters according to the present invention isdiscussed below.

When the first flowmeter 140 is to be calibrated, as shown in FIG. 4,the second valves 141 disposed at the front and the rear of the firstflowmeter 140 and the bypass valve 153 of the second bypass pipe 152connected to the second flowmeter 150 are closed. The calibration isperformed by comparing the measurement value of the first flowmeter 140with that of a standard flowmeter.

The flow rate of the refrigerant gas, which passes through the bypasspipe 142 of the first flowmeter 140, is measured by the second flowmeter150, and then the refrigerant gas is injected into the refrigerantdestruction facility 170.

When the second flowmeter 150 is to be calibrated, see FIG. 5, the thirdvalves 151 disposed at the front and the rear of the second flowmeter150 and the bypass valve 143 of the first bypass pipe 142 connected tothe first flowmeter 140 are closed. The calibration is performed bycomparing the measurement value of the second flowmeter 150 with that ofthe standard flowmeter.

Also, the flow rate of the refrigerant gas is measured by the firstflowmeter 140, and the refrigerant gas is injected into the refrigerantdestruction facility 170 through the bypass pipe 152 of the secondflowmeter 150.

In FIGS. 3 to 5, the black symbols of the valves 141, 143, 151, and 153represent the closed state, and the white symbols of the valves 141,143, 151, and 153 represent the opened state.

During the calibration of the first flowmeter 140, the refrigerantpasses through the first bypass pipe 142 and is then injected into therefrigerant destruction facility 170 through the second flowmeter 150.During the calibration of the second flowmeter 150, the refrigerantpasses through the first flowmeter 140 and is then injected into therefrigerant destruction facility 170 through the second bypass pipe 152.Therefore, it is possible to perform the calibration of the flowmeterwithout stopping the operation of the device.

Moreover, in the event of a failure of one of the flowmeters 140 and150, the flow rate can be measured using the other flowmeter 140 or 150,and when the two flowmeters 140 and 150 are connected in series, it ispossible to reduce the margin of error to about 0.05%.

The refrigerant injection device for the refrigerant destructionfacility 170 according to the present invention is usable forrefrigerant destruction using the refrigerant destruction facility suchas a gasification melting system, a rotary Kiln furnace, a stockerfurnace, etc.

As described above, the refrigerant injection device for the refrigerantdestruction facility according to the present invention has a number ofadvantages and advantageous effects such as:

1. Unlike the conventional refrigerant injection device which employs avaporizer, a heater, and a cooler which require large energyconsumption, for the refrigerant injection device of the presentinvention, the evaporation rate of refrigerant gas is increasedcomparatively by the use of the decompressor. Thus, it is possible toreduce the cost of energy consumed for treating the waste refrigerantand also reduce the installation space requirements for such a device.

2. Because the refrigerant injection device of the present inventionemploys two flowmeters, it is possible to more precisely measure andaccumulate the amount of refrigerant injected into the refrigerantdestruction facility through the correction between the flow ratesmeasured by the two flowmeters, thus improving the accuracy about tentimes that of the single flowmeter; and

3. It is possible to selectively measure the flow rate and perform thecalibration without stopping the operation of the device through the twoflowmeters and bypass pipes connected in series, and thereby it ispossible to effectively use the device.

The invention has been described in detail with reference to preferredembodiments thereof. However, it will be appreciated by those skilled inthe art that changes may be made in these embodiments without departingfrom the principles and spirit of the invention, the scope of which isdefined in the appended claims and their equivalents.

1. A refrigerant injection device for a refrigerant destructionfacility, the refrigerant injection device comprising: a refrigerantcontainer storing refrigerant; a decompressor connected to therefrigerant container and decompressing the refrigerant to be easilyevaporated; and a flowmeter measuring the flow rate of the refrigerantdecompressed by the decompressor.
 2. The refrigerant injection device ofclaim 1, further comprising: an oil filter and a mist filter removingoil and mist contained in the refrigerant decompressed by thedecompressor; and a drain box storing the oil and mist filtered by theoil filter and the mist filter.
 3. The refrigerant injection device ofclaim 1, further comprising a sampling port for analyzing the purity ofthe refrigerant provided in a pipe at the rear of the oil filter and themist filter.
 4. The refrigerant injection device of claim 1, wherein theflowmeter comprises a first flowmeter and a second flowmeter, which areconnected in series, such that the flow rates measured by the first andsecond flowmeters are compared and corrected to obtain a more preciseflow rate of the refrigerant.
 5. The refrigerant injection device ofclaim 1, wherein the first flowmeter and the second flowmeter areconnected to a first bypass pipe and a second bypass pipe, respectively,and wherein, during calibration of the first flowmeter, the firstflowmeter is closed such that the refrigerant passes through the firstbypass pipe and is then injected into the refrigerant destructionfacility through the second flowmeter for measuring the flow rate of therefrigerant and, during calibration of the second flowmeter, the secondflowmeter is closed such that the refrigerant passes through the firstflowmeter for measuring the flow rate of the refrigerant and is theninjected into the refrigerant destruction facility through the secondbypass pipe, thus performing the calibration of the flowmeter withoutstopping the operation of the device.
 6. A refrigerant injection devicefor a refrigerant destruction facility, the refrigerant injection devicecomprising: a refrigerant container in which is stored refrigerant; anda decompressor fluidly coupled to the refrigerant container, thedecompressor being configured to decompress the refrigerant being storedin the refriferant container. to be easily evaporated
 7. The refrigerantinjection device of claim 6, further comprising: a flowmeter operablycoupled to the decompressor for measuring the flow rate of thedecompressed refrigerant from decompressor.
 8. The refrigerant injectiondevice of claim 6, further comprising: an oil filter and a mist filterbeing configured so as to remove oil and mist that is contained in thedecompressed refrigerant; and a drain box operably coupled to the oiland mist filters and being configured so as to store the oil and mistfiltered by the oil filter and the mist filter.
 9. The refrigerantinjection device of claim 6, further comprising a sampling port foranalyzing the purity of the refrigerant, the port being located inpiping downstream of the oil filter and the mist filters.
 10. Therefrigerant injection device of claim 6, further comprising a firstflowmeter and a second flowmeter that are connected in series.
 11. Therefrigerant injection device of claim 10, wherein: the first flowmeterand the second flowmeter are connected to a first bypass pipe and asecond bypass pipe, respectively, wherein, during calibration of thefirst flowmeter, the first flowmeter is closed such that the refrigerantpasses through the first bypass pipe and is then injected into therefrigerant destruction facility through the second flowmeter formeasuring the flow rate of the refrigerant and, during calibration ofthe second flowmeter, the second flowmeter is closed such that therefrigerant passes through the first flowmeter for measuring the flowrate of the refrigerant and is then injected into the refrigerantdestruction facility through the second bypass pipe, thus performing thecalibration of the flowmeter without stopping the operation of thedevice.